Fridge / Waterworld

Fridge Brilliance
  • The Mariner basically fails pretty hard to emote at all throughout most of the movie (blame Costner). On the other hand...maybe it has something to do with him being part fish. Think about it.
    • Much simpler explanation for the understated acting job: the character spends something like 95-99% of his time with only himself for company, with brief interactions with (likely equally undersocialized or possibly crazy) sailors or suspicious, backwards atoll-dwellers (who he seems well aware would kill him if they knew what he was) being his only interaction when he does communicate with others. He's probably lived that way his entire adult life, why exactly would he be an emotive and charismatic sort?
  • This troper just watched the movie for the first time in a few years and realised an extra dimension to the mariner flipping out at the beginning when his limes get stolen - he needs them for the vitamin C.
  • The Mariner's fascination when he sees the gull perched on the balloon's gunwales isn't just because it's a kind of animal he's never seen before. It's that it's the first living creature besides a person which he's ever seen that can stand on legs, recalling Helena's earlier remarks that humans were built to run, not swim. Even if he hadn't spotted the mountaintop just afterwards, the seagull's basic anatomy confirms that dry land still exists.

Fridge Logic
  • If there's no one living on Dry Land, how could a map to there exist?
    • They do make a reference to longitude and latitude, but longitude is impossible to determine on a uniform, featureless sphere, so the point is still valid.
    • There were two dead bodies on the island. They could have tattooed the map on their daughter and sent her out to sea to bring others. Of course, there isn't much to go on in the movie for that theory but it makes sense.
      • The highest point of Dryland has a geological survey marker identifying it as Mount Everest. If they're sufficiently adept with Lost Technology to know how to use coordinates they're clever enough to know where Mount Everest is.
  • Here's another headscratcher: Assuming that these Atolls are all built using salvaged materials from the ocean floor, what's keeping it all afloat?
    • The shape? A rock, properly shaped, can float, despite it sinking, well, like a rock in normal circumstances.
      • Indeed, it's called a metal-hulled boat.
    • Some might be built on chunks of tufa, which floats in water.
  • How did the beach erode away to sand in such a short amount of time geologically?
    • Through whatever process made the air near the peak of Mt. Everest thick with oxygen and of an apparently tropical temperature.
      • Well, to be fair, if the oceans rose that much, the atmosphere would rise with them. And Nepal's latitude is similar to Florida's, so it's not that far-fetched that it would be tropical.
    • Forget that, how are there horses on Mt. Everest but no sign of human habitation save a few mud-and-stick huts and some long-dead corpses?
      • Possibly some of the last survivors of the original sea-level rise had to ride horses to get to Everest in the first place. Their descendants died out, but their horses' descendants didn't.
    • Beach sand is mostly ground-up coral that was gnawed off reefs and pooped out by parrotfish and other coral-pickers. It just washed up there, same as it does on beaches today.
  • How the heck could there have even been enough water in the first place to swamp almost the entire surface of the Earth? The idea that even Antarctic meltwater could cover, say, all of Colorado is preposterous.
  • How is the dirt the Mariner digs up even useful? It has been sitting under salt water for who knows how long. This soil would have such high salt content, nothing edible could be grown from it.

Fridge Horror
  • As the Mariner and Helena escape, he shoots a harpoon at the gunship and tows it to blow up the Big Bad's boat. Except, there were two kids on that boat who were using semaphore flags. It's not shown, but only the Big Bad manages to (just barely) make it off, and he loses an eye in the process.
    • He also blows up the Big Bad's boat at the end for no particular reason, which is packed with dozens if not hundreds of men and women who simply want to find dry land, taking out what could well have been one of humanity's last hopes to establish a stable, genetically-diverse population.
    • Actually it is stated in the novel that the feral Smokers are the textbook example of Humans Are Bastards such that even the small young children are amoral sociopaths.
  • Since we are already on the subject of genetics - it requires a population of about ten thousands to avoid problems with inbreeding. Another five to be extra sure. Not even Smokers had such numbers, so humanity is screwed anyway.
    • Possibly if the Mariner encounters others who pass muster as decent people, he can send some of them to join the group on Everest. Maybe not enough for the population to thrive, but at least enough to get them through the current bottleneck. After that, inbreeding may well be a good thing, if it brings out more gilled mutants who won't need Dry Land to survive.
    • Species have survived and come back from far smaller populations than ten thousand.
      • Yes, simple species have come back from less than 10,000 individual members when closely monitored and maximum genetic drift is ensured by forcefully introducing mating pairs from different areas. Humans are much more complex, and have many more opportunities for something to get genetically wonky. Unless there are atolls with populations of thousands (which didn't seem to be evident), humanity is on the way to extinction. Downer endings galore.